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[函数] 函数的最大值与最小值

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敬畏数学 posted 2016-12-5 18:25 |Read mode
Last edited by hbghlyj 2025-3-29 02:30$y=(x+27)^{1/2}+(13-x)^{1/2}+x^{1/2}$的最大最小值?

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kuing posted 2016-12-5 18:28
参见《撸题集》第 1035 页开头的两个链接。(为啥你问的题总能在撸题集里找得到……

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original poster 敬畏数学 posted 2016-12-5 19:03
回复 2# kuing
呵呵。确实。

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original poster 敬畏数学 posted 2016-12-5 19:37
回复 2# kuing
柯西(或者构造向量)的那个系数1,2,3貌似直接观察啊。如果待定解的话会遇到求导同样的问题,不易求得。最小值应该相对容易些!

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力工 posted 2016-12-5 20:45
回复 3# 敬畏数学


    专研钻研kuing的撸法

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色k posted 2016-12-5 22:05
回复 5# 力工

我没撸这题,只是给了链接

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isee posted 2016-12-5 23:37
参见《撸题集》第 1035 页开头的两个链接。(为啥你问的题总能在撸题集里找得到…… ...
kuing 发表于 2016-12-5 18:28
这种半代码很生硬,虽说沟通没问题。

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色k posted 2016-12-6 00:01
这种半代码很生硬,虽说沟通没问题。
isee 发表于 2016-12-5 23:37
啥意思

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isee posted 2016-12-6 16:36

    就是不是mathjax 显示的公式,但知道楼主的公式,所以说半代码

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kuing posted 2016-12-6 16:51
回复 9# isee

毕竟混论坛这么久,再不规范的输入都能自动脑补成功,也懒得去建议什么了……

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isee posted 2016-12-6 18:03
回复  isee

毕竟混论坛这么久,再不规范的输入都能自动脑补成功,也懒得去建议什么了…… ...
kuing 发表于 2016-12-6 16:51

    哈哈

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